Jbl diy m2

[Steph]

Hello!

Finalized my own M2 clones some days ago

Many thanks to all forum members and special ones to KW55 who supplied the parts and to both KW55 and Pos for their help in the building phase.

Regards, Stéphane.

[Steph]

[srm51555]

Great work! Thats one awesome first post.

[Steph]

[Mr. Widget]

Nice!

Excellent documentation as well. Thanks!

How do they compare with the Dynaudios?

Widget

[Earl K]

Beautiful !

I love the cladding !

[sebackman]

Fantastic!

Brilliant work. And well documented.


Now we all have a template.

Thank you

//RoB

[Steph]

Thanks !

I already liked the Dynaudio a lot, but the M2 sound much better in many aspects! Strings (violin, cello) sound more realistic and less aggressive. Low frequencies are much cleaner (and deeper) and directivity considerably lower! All in all, a nice improvement

Stéphane.

[Hoerninger]

Fine shower fine work.
Thank you!
___________
Peter

[hlaari]

Great work

I like very much your work with the interior rigid
do you not think at the port diameter is to small?

I can not wait until I will have time to start mine with the 1501Al-1 and 476Mg



Ari

[DS-21]

This is the flagship speaker JBL should make. Elegant design and craftsmanship to go along with the SOTA parts.

[Steph]

Hi!

Thanks again for the nice comments!

Ari, the (constant) port inner diameter is 76 mm for a length of 193 mm (x2). This is what I calculated for a 154 L volume tuned to 26 Hz (Bessel alignment). I estimated these dimensions should not generate audible turbulences until half of the max woofer excursion, and would avoid a too low resonance frequency of the ports.

Do you think this was wrong ?

Thanks & Regards, Stéphane.

[hlaari]

Hi!

Thanks again for the nice comments!

Ari, the (constant) port inner diameter is 76 mm for a length of 193 mm (x2). This is what I calculated for a 154 L volume tuned to 26 Hz (Bessel alignment). I estimated these dimensions should not generate audible turbulences until half of the max woofer excursion, and would avoid a too low resonance frequency of the ports.

Do you think this was wrong ?

Thanks & Regards, Stéphane.

No, there is nothing wrong!
if they are 76 mm everything is correct, they are bigger than they look on the photos
2 X 76 in diameter should be very close to correct size for internal of 154 L volume tuned to 26 Hz

are you going to make grills for them also?



Ari

[Steph]

No, there is nothing wrong!
if they are 76 mm everything is correct, they are bigger than they look on the photos
2 X 76 in diameter should be very close to correct size for internal of 154 L volume tuned to 26 Hz

are you going to make grills for them also?



Ari

Cool, thanks Ari

Yes, I'll probably make grills, as I'm not fully satisfied with the aspect of my black paint. I guess the bottom of the horn with the round shape will make it a real challenge!

[johanwholst]

Congratulations on a great build!
I have cutted most pieces for my d2 clone and will start glueing this week. Will do extensive bracing similar to yours and the original.

What kind of amplification and dsp do you use? Did you drop the passive network? I'll probably pass on the network as I am quite happy with a Diy Pass labs aleph for the D2. absolutely quiet on this tweeter, enough power for home use and to my ears pleasing sonics. Crown cts on the 2216

Another question: What dimension did you use on the baffle plate? 16mm seems to be right for the waveguide, but a little bit too deep for the 2216nd